Earthworks 521 - Single Channel Preamp - 500-Series Module - B-Stock

Earthworks 521

This B-stock Earthworks 521 is in mint condition and has been on display in our showroom, this unit has not been powered up. The Earthworks 521 is a single channel 500-series mic preamp.

The solid state 521 features switchable phantom power, polarity invert, and peak amplitude clip detection, just as in the original 1021 single channel ZDT Preamp. The transformerless output stage of 521 ZDT easily drive long cable runs without loss of quality, making it ideal for long cable runs. Transparent gain is switchable from 5dB to 60dB in 5dB steps.

The Earthworks microphone preamplifier topology provides outstanding common mode rejection, excellent overload margin and an incredibly low noise floor, combined with the ultra wide bandwidth of the ZDT Preamps and distortion of less than 1 part per million. This exceptional level of performance is maintained over an extensive range of impedances applied to the input making the 521 suitable for practically any microphone – ribbon, dynamic or condenser.

Features

• Zero Distortion – less than one part per million
• Solid-state, transformerless
• Switchable 48V phantom power
• Polarity invert switch
• Peak amplitude clip detection
• Transparent gain switchable from 5dB to 60dB in 5dB steps
• Ultra-low noise floor
• Ultra-wide bandwidth
• Suitable for most ribbon, dynamic or condenser microphones

Specifications

• Preamp Type: Solid State
• Number of Channels: 1
• Frequency Response: 2Hz to 100kHz ±0.1dB, 1Hz to 200kHz ±0.5dB
• Impulse Response: 1.4µs
• Distortion: XLR out: less than 1ppm (0.0001%); 1/4” out: 0.001%
• Input Noise: 1.6nVHz½ at 20dB gain; 0.6nV/Hz½ at 60dB gain
• EIN: -132dBV at 20dB gain; -143dBV at 60dB gain
• Slew Rate: 22V/µs
• Output DC Offset: ±1 mV typical, servo balanced
• Input / Output Connector: 500 Series EDAC Edge connector
• XLR Input Impedance: 10KΩ phantom on, 100KΩ phantom off
• Front Panel Balanced Out: ¼” TRS XLR Fem. balanced transformerless (variable)
• Dimensions: 1 500 series rack space 1.5” x 5.25” x 6”
• Weight: 0.8 lb. (0.36kg)